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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f3340f42451541a8084dcb0039c4bed00ee87fa454129830d6f17ca40a8885' 
  AND token = '6AmZmlVWf8VdecBfRKVxpHjtukIk3wNQWFUI/obDfzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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