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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b2ed2f39433664ed966add21c98df28d437f0e6bc74ebfc8c427880a7d98ef' 
  AND token = 'n83j2rp0UnTUnAuzhqmrkmdDhVFQ4gOsUdWgiwrExfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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