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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08e1b5bbe8f3b718e8f163765eddb0916fdd5332ceec1b3c1c80d7a4bc0f609' 
  AND token = '06fnkbUrSPSSwxPORIa4bBL2RwgLsiueeFNx6wxii9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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