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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee3ae725e213d3c4f4f4f23642e5ee1413eebb668c6316e0998e5870a4234b2' 
  AND token = '0qtbK2RIcIBf6g/QEU1JbbzC0q9SDOaTkJGxZJXhzOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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