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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba5cabb9cf8350367e54336ad211f40eb4491a762199f3a425daf9e603e2bf6' 
  AND token = 'h4/cmBjUanDbQpDZH1kpTGiD6WV5GA7MSMenH2xC2vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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