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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c483eb5a94947a03d42c9f0762cd66307da53af70819e0538502baf9dc6ae104' 
  AND token = 'OBlARKvkfMzjW+jFOLq8bL/4gRE7vbTvr602ok42qdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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