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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17675dec859ff461fc79803bb34bd1de9625099acee34ba6dec3c833a2bd4ea' 
  AND token = 'sHImLrJYv067xdi8f7MxS217ns97cxG8WJNX/xvBRfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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