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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8093c1c75e842c3a8bcc16e88ca6a0f63ebbbef2e503e174d67cabbe802dc17' 
  AND token = 'UHqksfm1U8AJa5jstnrLa8LoHhFlUj6tJNdz8mUWrOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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