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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1d29a5f493d92eca7681eee5d4ebb4c2a855f1667f03dac0e4f6dc088c5b02' 
  AND token = 'kzHAzHEVsZ3tHt2cei3KZFllN7nwMJW9OZYwbws8S+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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