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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6d8ab39d1d96d0d7bdbfbf416c40fe2f10f40754f0585e86f9be399a84b85b' 
  AND token = '6HsJIDk8PaqWZMFYojgz/Vu1ssn3b6+wWR6fnE5jP0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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