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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360b0f44c69d24e0ec9c3310959d7e3937a95443397d03c4c0d392ffa1ba3863' 
  AND token = 'iHolrkuuqSn3W7IIiHbc/GvF4VPWYpOHrtsyPAQqPQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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