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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120ffd62eef628228c041497700162e4725878df591eb1ccaad700b2be23f8a1' 
  AND token = 'QMrvYtw5sw6ewZR/vmadwe5cs6HciSKuWe9iILqll+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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