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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90683108ca8280410afdf135131ca5bd3063eff17326030c4d89c095c8020fb0' 
  AND token = 'sFsKOe4KnkDOvmWLn96WkJMLONvcwOAxUutLny50hrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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