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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c542ffbb2b205a0604dc21639f3f724aea102f0ebe44db9b2c4072f6b29d6b6f' 
  AND token = 'Go8s9Aphs467G0EWE0zFgu2rj9uTomINwRr8nTuQkTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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