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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4ff9f935c1e87f13836dee5e7be3c7890aca2fe3a01fbf607342328fe71df4' 
  AND token = '1zXlHewnMS6D4y3OwPKigIaUO+E9vmCB2pl+QioaVrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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