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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8659d1066565bfb26e30d1f429fe356066d86e2914b158c654a2f8af6204b9' 
  AND token = '8usftOn09KcBu1FTnWCTLLXIfwWlAH9VHQjO30gX3P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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