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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e690a020c8a4154fe32b65352f1f35ee32059410dd3cc85ce1b9fff9a6bcbea' 
  AND token = 'wJjRLNiVoNC/uD0L1z8JaZB9mkPL3PwRCjGy4Ck4oN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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