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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14d47cb0e6490b10851661e2185d988f5379f5e4b30ddf804b92430cac2b881' 
  AND token = 'TJxfkxpFajCXI0t/crlkE+9/KEh+DAXeQcjWAhkJapY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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