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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f41ee02cf5d407906a3b240d7db5b82a02ba2178a1e460708621b52d5d373b7' 
  AND token = 'XZkL6Za/asa/vggpVNbh1OqBZ1+HSZaou9rdkJS6nEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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