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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798b40489d5e795ce740b906c55ed5e94ed383f93568c6b4c5331e03000bcc1b' 
  AND token = 'lA/Xlt2sc3oces4kOS5LtesqFcICvQkel1mjtyVynEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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