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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fc35ffa76013d27c570d4aa092f0ff40844e0577199ed56be23d828876a09d' 
  AND token = 'JibNCmegz4W/C5i3UrhL4BvdOjBlF30k2K4baSIq2v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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