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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522e41ff4d1947d715fe9d9d4ea615926c80628ab5863c127e37f7d675f4a445' 
  AND token = 'fJMgv0QrPmgomT0QQA0gvoWuoVpq8PI+68JGVcrcKXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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