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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836e6559793374e9c240301b2a6262a95ac0c55f288dd2c791a900813a01fbc9' 
  AND token = 'wm6ev1iDqe663aJIuAa3VPTAZSfJXJylCAzTTxTXygw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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