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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a6fa91a89a8b1402db997fd67d735a0b3687f579956970d47fb46fe24f8785' 
  AND token = 'bxdomX0ims7Ys6dP8vrtJbf5WnzG2A4nFKT9Xcjsr7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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