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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece56b3b5f50135fb51222c3eb2a6afa0f1ce2ba6f983b088158804cd3f1505e' 
  AND token = 'KRzj+gg2dTUVDjxCHGMOmq7/ck66OpeAUoPod/dORNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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