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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979cfd4345a42d6d04434456c3fbfc522f19037f692e05d5db45605ad4ec1654' 
  AND token = 'UQZY8aUeK6ADDfmBMf99hOuwU/ROCv/Ch9cMXGwnDzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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