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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd892a541ed994eee2ff0cffb42a583125ae852421c35ef6b81e3dc2dbe584c9' 
  AND token = '9d/ZV+0CZvY4gaw1hcSMgB/qdTZGPhWb61wOQN5et+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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