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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfc546f22cd22c1bd6c43538a9d980ce1b93688d176153519badf86db8b0b15' 
  AND token = 'AGPwiicuuDDkvLyETwUyPUvPogpWbYbvtNvLV+HIV1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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