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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3682bcdcbc9c3ba254d4779cd7a87ad456fb3c23ad92f52a63f37212f7ca6153' 
  AND token = 'hQQ/bLqsnPkv4yGLk3/XyVATP255KF1XwgY0fqqP52c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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