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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0915e24332646c587962f9c1100adf03269b9d0b3c61756ae16097124eb58b' 
  AND token = 'IOv6U213I+8YMM/3hBDMmlPwoxx7tejxbOvOmKmpQ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00165

JSON explain

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