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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41daea7e2cf471104a3807659ac4edbb39cc2926958f08839c0a03dadd07091a' 
  AND token = 'KkOOm3JX6dCSUQBHR0GPI7/eYj0RFpJy1RDy3iCyPcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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