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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3d089faf07f9d8d521b53bfbf19a3d003a60fa6557942986afaae5b6cc8ab8' 
  AND token = 'soRkOFOxohtjCYp8Va+jKTf5ubTx1KT84+NRSSaA4HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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