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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f923793774e312c3486eff28f9c1ffad56c546f9d20b029de3bdf92c78c9a96e' 
  AND token = 'cGzuTXawTKoReEVj/5BuCpiFNt1J5k7TaXUtt2Ibd5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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