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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be99e287938a90f62242ffc74209b23046b7bc1b781e9d8e89f8ba41b6e9a2fe' 
  AND token = 'E0ZLsLjpXRvnirG0kEohHJK2ot1yuHG2de6vE28v/ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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