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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947f43a0e3dedc8c136959c8e33da2ce1dfa1a563401187ca7819cee7e08a0d8' 
  AND token = 'by0TQutIMqcd86GLohlux0hwFT+b7ViAaRTr9+JB52w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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