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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0033f5ba5a26a877bc6cad652d7a8d53c57a84db05f82830c38d08d17cee5c8' 
  AND token = 'yBheSljI9xW67jQB799CmYIMsyqFULvRy171TzNMux0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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