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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87549f67eb15719e354a7a691562495870f0e496350684627afb6b62d786af2' 
  AND token = 'HRbiF8LlS0LiIZwzxYprgcO9ZNFbkjtJWJnK354r4Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}