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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5836a17ff8b7a57b6b8b836c77ff6e89e4f07509c8bfdb6c988a749b9a44e741' 
  AND token = '5toN5HBa7S2hDdmyIrZyqWhQeU+/tnVRHdwGpLPtl1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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