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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5d30adccd716e8c9ab3c6ce6c647de51dd59c49b0568293d49c1f626b5a567' 
  AND token = '5ah0rQsjNtg6RbnkFJUzRrMJEJqHL3pjM/0o0+Qn3bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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