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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a2f409dd9134c96a679c140e1a8613a0de3ed7630991fb1ea3055446853fbb' 
  AND token = '7W5vpBx5B+wrL/ETNUaJDyUJm9vSiqze9cV7tHEQjOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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