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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4686750214c6c2fc71783ea0f8dbef8c69c62a26e5ebe06d496e6c46833662f' 
  AND token = 'cQ60CJ2qCOR3PD3lm7dbOwaPF1u4OXa2Hbw8ikSmvkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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