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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938418a44b615c57f73d7726d7072dde833c0147b7c7ba254a4609e133f053c5' 
  AND token = 'GLRL4urgH/v6LUQTlJcBb1TIPdyPeu04FQCRUvVLgUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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