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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecf0520b60384a109ef9608a60d574e6dc01a694bce131f3871790eedbb1ab0' 
  AND token = '7CS1qSNewj1j7NbfytVMkiMI++Mvjo/Ev9TG6NC3E+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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