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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf8dd68d832ffefe70b1e108a8b305e6f63288046210d866ad48bee4db67578' 
  AND token = '8Yex4Od6H6KRi/zrSP9XnXR5FdurnQn8MaRP/W7lXn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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