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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8f61a88e50e207c966c118b29312ab3135eb23aa94eb37a5158bafdb64f431' 
  AND token = '5QgKh4r2gosen/jF6pOyW/ophqkcAbmNedl4wdC60Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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