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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d146258cbfd7ccf5d45a52d9a3e1f1429e1e940707e6983857e89298d7e271' 
  AND token = 'pD1TpDD70U9RdAvSDBayZ7NPn62pYi6oipYg24VRV+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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