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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd6b8d8fac8d06f2225acd6325738d719b68bfae0e6c4f381759bbbc0537967' 
  AND token = '+tMh/Aa6fRdsgK44EIjlSXZV7lWtzl5USDt32UEEOJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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