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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc02ad8a67a1ba3a4a234a76b68892be136a84d6b7b91b5144909958f392679' 
  AND token = 'djaWtHpCTRB+E27Ub6iyTfLkHkas8LnQiSkga1eq/+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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