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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86c6ef224e25fe116bdcb77cb5c2aab04a44869d182e1c7ad924f1867c50f1e' 
  AND token = '0TzRLtWLwlNXEzK2gHdRNL7BcatVIy3+KMMEesu63ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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