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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c78ff610be6dbe5895bb009a002ed81a5a613317fd8c200a35df50b1acb55d' 
  AND token = 'zZ55MTEGF8oziy1Gw88ncIs5HWZh+EwIhE10DWEqV18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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