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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dbeafc79432330ee274cfb5189b3c8339c77cb03acd8f93afb672efb26a7a6' 
  AND token = 'Yt1bgAp2LogOM+GDK8ZM99EHdpSnTm9hZnrpqAh/6DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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