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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc5ca94bd206d2fa6ade659f0db15b7ab276e18313c13f6ec73d54cfac7204e' 
  AND token = 'AU6nA3HoW/Fr6qzRJES1KJSIjv5/24ad6ACgcsaTlbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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