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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90788bf18e56d2688fa479559d98848f3169ee8a83928803dfb837c1270c489' 
  AND token = 'jfti42GFV4Ziy+uvsrg5MmuobHP+8kA2airVl4bvuCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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