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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347a635687c91e6e20093548a25469da76200a67f51714665ff394370ef78f0a' 
  AND token = 'Je0ZejxwLelvl465I6Cmk7kb8w/H9zaTh/2XASJks/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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