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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785ba1a4749cef9721e94a2c7852539b9aca4c274df706ae4cfb31a843f9fa17' 
  AND token = 'G8BNSM7ZrHoj9iPpsv3ctiAN/Srta2Kyivlj2X2pZ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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