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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26b9fae4067ed7826f94c333cfa8168341d77f96ac83e5c208ce6dfd400e6fa' 
  AND token = '/sAHt/VwUeKOt0UnWtHb8MZzF/ZRSpNktJAxjLrkyhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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