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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81100bfd17cb1effe1d3eb98a52afe65411ccb6d26dcd2d4402e07253e9f66d9' 
  AND token = 'iu/Tdkg0HdNkHKltSP+2ZJoOU8ObftjVEEFFKTccRTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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