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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2298c4594ad7a14e68f1b94cef0b64433616ef0c098b8a7a62bee4f7cd65ff6e' 
  AND token = '55DR5gUeSUsDdkbXi6ZlTdz5E5wcLd3saQQF6tS4Tyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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