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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6b620b60903e5c468e931b7d060f1f2d421fb3d3d67e3ef164c7d4d1221d58' 
  AND token = 'n1st6fJeQDFY+PcNh1IcOHQrrHSKI0IduU/txjZLEmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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