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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c0c282e6acf9bbd863252665f716926f532e221f6058ab61726c5ec81cf589' 
  AND token = '0BOaz96GXDeSkgiyenLboxm/Tz/6b/KIjb+vCOw+ggU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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