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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289bf3027fa29675a6efec49414ab4a336f5166a854ddda6ff6d3a2370e9df3c' 
  AND token = 'YfPdirm4orymzPFzlUX8EBQU0XvXQWqsR7Nor3t4M0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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