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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a8bfae9bf526191e96ee94886f98132f6873310b81d47938de4ccf07055a19' 
  AND token = '5HxqYUGRVBSu5ybQqC8LCCgzHK3prrryzuienEQCpuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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