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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233e8e1771e3940004ac0c3d6803de2703cc86c116eb5d7cd7792565d59fffbd' 
  AND token = '7v1tGr2VqoMCt2jGdZOHVSYypYX3gAIyiI9GmRey6Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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