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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09eb7e071aad1b3396bacd6e72dad612f8f4ac77801750b2dff0118c6dc6ba9' 
  AND token = 'Bv6c8WJ+TOs9Ux8cFsk1BtJpYlJUEXEVHVo11CqEW9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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