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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb5fece87d1c902b0c1cc6332efa8f75306b659923fe12558bbb546d5cc83d2' 
  AND token = 'y/R4XF5jxV5itIZCcmq3QD9QMGz48zzWU/3dvZ9h94A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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