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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2aa3487487dd6c40bc226fa8fa1fed1a1b4afeb7cc958dee1ff07e360829ef4' 
  AND token = 'DfPhbNjyJcwa5mQ0nbdvGEpNkzl/DdrbtZhTGmt9I6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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