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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039547ff31d309dabbdb6594b6d35f935936956edc691bf0d46590d41ccc5834' 
  AND token = 'jx4vsshpCSU79jHNuW/gbpFWMJk9kqMxz+2P1sDukvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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