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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a63bbdfde44e1c4ef4ba04ee71d91a02a66dce54305678b8db07e94f203ecf' 
  AND token = 'N+yR7aW4DqX0tw2wdlphLr4km2jaKlZfnLzUJq5p9GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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