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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0852acafa4a668f25b8091ae07c656b8ef13d81b5e3cd0c74346d9512c65b7' 
  AND token = 'JSdRrLkegVMTaUQOXo9oxWU6XOtDFrTYqrolrULOb7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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