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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632b69e4b7448e565771836f31a9544e69a869c1b78859a3b587174bd3244393' 
  AND token = 'EKKv9K6grPM33ithonhNdPWk87pOzp6vI3+hPv/fyzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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