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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90027039d2b23482af3bafb2461767f9fbb45bdf8700a36cc7c0dcd00d1ece7e' 
  AND token = 'Ny71iPMc56D55LKk8yuhGF5fUbB6KKFWYX85PUF33x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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