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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25615decfedcc4b891ae84215844b677058bc55aa15e8b5061db0d5697bf2d1d' 
  AND token = 'kh618xbk5vcKR9WUiV9TczVH33QzhFyjc+kYjgbjgAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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