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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ad0352e8a991f054b0f3a6d40ea2decc23c49be4c3bd72329de80bfb0abf9f' 
  AND token = 'leUEW8xyky4LNex/pkyZ8AGQfYkJ2WMJrxGlIWyE8T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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