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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca498368d6ef4faff6b66d6bba7b69d5e995cb735ecdaf69cec1ab95802b5d95' 
  AND token = 'lSmuW+oGqOWReQX7PPuk0q26veQx8MwIrW6Mm8a4yos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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