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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21bc41ba86b58a076bef218378fc99f84aab7b74e45b87fe838b3061ca212cc' 
  AND token = 'D5LCkR0Z5Gs7UaN9lxzF+QtxTatErUPF75WW34Ox+cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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