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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50036730eed56f71a6255b9eac572f0c3f0a75a48c0bd6eb80d5e55fd31c5a7d' 
  AND token = 'DRs8MrtHwxSewNvXt5kA6lpaHUBVvm6Emw3Hz8c4k30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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