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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7836420a9145236c5ffe6ed571f5552c83d5b86f8d94dc4044e0420626b31678' 
  AND token = 'LkQOKXYV2wy3UPsq1Y/Bsbp3eJX2sJ72R4t2J7QTRH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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