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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ab4b81cabeb799f8fbbd06cac72fce0c2af6ec8999a90669dfccefa00abdfb' 
  AND token = '4+c2k7VDDzc0e5tWxTX1HMtwKdNoHaPNPXTKgCKwxNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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