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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac70cc719bcd6ddd497c1b3d2553b4f13377661a397616f1dd931ff7af3a8a0f' 
  AND token = 'jH36cC066x3CngBVKV2MOWZ5+1nRaj6TWrPUWUnFeeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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