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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd3a90ac7bb666f09ed20e3feb1508b3d5a185a119cd5fb328a57c7007ba4c0' 
  AND token = 'UZqyOmF6n/0YloQpmx9QyEbuEWH1Fmkaj4cWy2WocIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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