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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f62de794e35cbfca963da59db8aae051b87e68517be18924ffadbdf186b3d0' 
  AND token = 'VSncT6F17kpKtGrMs3QuKXjrPYayd3nD2qOg5yLHwTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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