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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9ba17819faa8a05e6179a7edc72a78eebc40a656acae3de8adbca3647bdf4a' 
  AND token = '5fgXwWcs2+k1syXjlGjHPhVzzQRAha71ZH8mhESQSs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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