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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08494e620e2e6045a00a46a2bd46aaacbddaf885dff4a3a195aa2e1295598ac' 
  AND token = 'q6hLZG1HrCUekCWSEFOIA2Yw+BNyI5LRhB1k8Jozq0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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