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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38407457e93d7bb628ba07ca1a02149447def8f8d7c09297a23624529ada3eeb' 
  AND token = 'vQCQS7FTPyPU+8DDWbv8fgZyomGbkSIJPF/6vrkorzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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