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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ae5837cdd7a068991271389d36a5d9c81617d692ddcfca9c59edf4db1e1a25' 
  AND token = '6UI2gSUqc3AuDpVtc75IEhiljjqgROPaZ3i/TOHO2EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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