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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee076d3c77a6abd2561c98eb9065a452d2516fd0991a44260d80be0e49c181df' 
  AND token = '96ci4KWfvuKxFTSBgoImmK1Xj/jDp45YuJ/OkSYv0nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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