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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd822c6a962542dbb4eb25c99b251b8a06cbd11a1843329e1c2394fba703cbed3' 
  AND token = '3tLe0rlE4kPIhEkm+Yp7YBby8AoLF97bUOO/tiqvwZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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