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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd79e4533f0205419570b2529d66bec04f500f474f85449dd81ad0cb20210bab' 
  AND token = 'RrBZWWCrD0gAYBU5EAAuC4gz+yEC5zWwTw81z4B43No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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