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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855e4e5b0721d3f6316903d891c81c9cf6fb05f55be7eebf59d37861f316f1d0' 
  AND token = 'XxmuE6XcW3u4qQg8/hmuNmxoNprJUjpouGSkMT6wCgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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