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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c198eef40adf8222f3ba196a5abf5263843c29d44d4e251e423548f066210927' 
  AND token = 'L8ERdpOIXt+Hwfc4IV667Nuez092Fu+DLULnW7/Qkt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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