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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be794f0d43a3cd84a0ab345f1e1f87c53b60192cd90bf7458dd3a2eb7a84c13' 
  AND token = 'aeiaA9pt9DCkPk7A0PX7QQG9TI/nxFFR8m6Y1iEVavk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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