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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2dd3469607bda8e073ecaa897cd1006d1acb570fa5edb5069a52138d6dfa4a' 
  AND token = 'e9NhEbXneaYmwj3FN3cKK7Fm7lJXkXGvw44uZsiFODM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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