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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae6c3e42275e2a1b59fd693929a2b6d3894c18f34cebddb1972bbb73390a3b2' 
  AND token = '1xeQQTj5o3SSPmcVJ3hXYdNHAjObWlWzVY2Jw07ED8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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