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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd84078f0c05d6d488d325389a9e3d1855718e641b83d3867340ff0bf3cfa17c' 
  AND token = '47flFEE0Bx5FcLcmyxNgGlGli0Jn40yqoXSaWQvjIhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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