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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d83d5be211070c95f8bb4fddd6b14cbedf1741ef2e146976b46048ef90b3e71' 
  AND token = 'eQeeFYSqzW0XFLzD3MqzZDY2l8TQHX/Wx2nn/OstcaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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