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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b0848bf422b3d91159602596273cbb126aad77e843bb85c68cafc71d7a324f' 
  AND token = 'Zx0/SWAV4Z80XdDfoL2rgknj3BTHjNKKm/ZBrD3sq8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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